References for DBContext, DBSet<> in Entity Framework

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I am trying to use ADO.Net Codefirst feature of latest Entity Framework 4.0. As part of that I have installed Entity Framework CTP 4 from Microsft and using Scott's tutorial to create the model first. Inside the tutorial DBContext and DBSet<> is specified. Could some tell what is the reference to be used in order to access this class.

I have used the following references however nothing happens for DBContext and DBSet<>

System.Data.Entity
System.Data.Entity.Design

Aerodyne answered 4/2, 2011 at 13:56 Comment(0)

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Use CTP5 instead it is newer version with some changes in API. You have to add reference to EntityFramework.dll which is installed in CTP directory - default is: c:\Program Files\Microsoft ADO.NET Entity Framework Feature CTP5\Binaries\EntityFramework.dll for 32bit system. On 64bit system it will be placed in Program Files (x86).

Jackqueline answered 4/2, 2011 at 14:0 Comment(5)

Could you please tell will it support for 64 bit .Net version? – Aerodyne 4/2, 2011 at 14:17

Not anymore. Now you would just use nuget Install-Module entityframework – Mincemeat 15/1, 2013 at 9:25

@TeunD: Yes, you can post it as separate answer. This answer was pretty valid for the version OP asked ... – Jackqueline 15/1, 2013 at 9:28

Instead of referencing entityframework.dll manually you can install the EntityFramework package from Nuget – Ranite 7/4, 2013 at 19:12

Post is old...but now I think the link is broken. – Scorpio 15/1, 2014 at 12:47

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You can use the Library Package Manager if you have it (it installs automatically with MVC 3.0).

From within your project in Visual Studio 2010, go to

Tools > Library Package Manager > Package Manager Console

From within your project in Visual Studio 2013, go to

Tools > NuGet Package Manager > Package Manager Console

In the console, after the PM> prompt, type

install-package entityframework

This will install the package and add the EntityFramework reference to your project.

Vituline answered 3/4, 2011 at 3:36 Comment(2)

Install-Package : Unable to find package 'entityframework'At line:1 char:1 ...any idea why? – Intentional 7/1, 2016 at 18:1

Looking at NuGet-Solution package manager, I can see I have EntityFramework installed (v6.0.2)...but DbContext still could not be found. Any help would be great. – Intentional 7/1, 2016 at 18:7

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Use CTP5 instead it is newer version with some changes in API. You have to add reference to EntityFramework.dll which is installed in CTP directory - default is: c:\Program Files\Microsoft ADO.NET Entity Framework Feature CTP5\Binaries\EntityFramework.dll for 32bit system. On 64bit system it will be placed in Program Files (x86).

Jackqueline answered 4/2, 2011 at 14:0 Comment(5)

Could you please tell will it support for 64 bit .Net version? – Aerodyne 4/2, 2011 at 14:17

Not anymore. Now you would just use nuget Install-Module entityframework – Mincemeat 15/1, 2013 at 9:25

@TeunD: Yes, you can post it as separate answer. This answer was pretty valid for the version OP asked ... – Jackqueline 15/1, 2013 at 9:28

Instead of referencing entityframework.dll manually you can install the EntityFramework package from Nuget – Ranite 7/4, 2013 at 19:12

Post is old...but now I think the link is broken. – Scorpio 15/1, 2014 at 12:47

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Use "DbContext" vs "DBContext", and "DbSet" vs "DBSet". The case sensitivity is the issue.

Christan answered 11/2, 2011 at 8:21 Comment(2)

Thomas, I have just speciied the code, not copying and pasting this. I used the correct case in my code as it was copied from original tutorial. However thanks for letting me know that the keywords are in incorrect case. Cheers. – Aerodyne 11/2, 2011 at 9:28

thats it...I did the mistake. – Erotomania 1/2, 2016 at 13:40

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To add EF to your project use the Package Manager Console and issue the command:

Install-Package EntityFramework

You shouldn't link directly to the DLLs' installed location as mentioned in another answer.

Assured answered 26/4, 2013 at 20:52 Comment(0)

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The blogpost mentions the assembly:

The DbContext and DbSet classes used above are provided as part of the EF4 Code-First library. You’ll need to add a reference to the System.Data.Entity.CTP assembly that is installed into the \Program Files\Microsoft ADO.NET Entity Framework Feature CTP4\Binaries directory to reference these classes. You’ll also want to add a “using System.Data.Entity” namespace statement at the top of your “NerdDinners” class file.

However I do believe the new CTP5 includes some changes to codefirst, so I would suggest to take a look at that one instead.

Hope answered 4/2, 2011 at 14:0 Comment(2)

Could you please tell will it support for 64 bit .Net version? – Aerodyne 4/2, 2011 at 14:17

I am unsure if there are 64bit assemblies in the CTP. If not, your project will need to target x86. – Hope 4/2, 2011 at 14:50

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I was following the MvcMusicStore Tutorial (using Mvc 4 instead of Mvc 3).

I found in Part 4 I was having issues with this (http://www.asp.net/mvc/tutorials/mvc-music-store/mvc-music-store-part-4).

When I added the following reference using System.Data.Entity;, I got the following error:

the type or namespace name 'entity' does not exist in the namespace 'system.data'

@Fecklmore's solution worked for me.

Open the Package Manager Console by going to Tools > Library Package Manager > Package Manager Console.

Then type in the following: Install-Package EntityFramework

This will install EntityFramework (i.e. EF) into your project, and will eliminate the error above.

Tengler answered 5/8, 2013 at 2:51 Comment(0)

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if you are using .NET 3.5 then change your target framework to .NET 4.0

Whaling answered 15/6, 2011 at 16:12 Comment(1)

Thanks indeed @Arek Bee, I have used .Net 4.0 however some how reference is not there for Entity due to some reason. Later after installing the CTP5 everything was fine – Aerodyne 17/6, 2011 at 16:47

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